That grading zone this tolerance shall not be applied

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Unformatted text preview: or to percentage passinqany other sieve size on the coarse limit ef Grading Zone I or the finer limit of Grading Zone IV. aggregates are available they need 4.4 All-in-Aggregates - If combined may be not be separated into fine and coarse, but necessary adjustments made in the grading by the addition of single-sized aggregates. The when analyzed, as described in IS:2386 grading of the all-in-aggregate, (Part I ‘)-1963 shall be in accordance with Table 5. 7 IS : 383 - 1970 TABLE 1 LIMITS OF DELETERIOUS MATERIALS (Cfme 32.1 ) METROD ox TEST D~ZLETERIOUS $JElSTASCE (I) (2) i) Coal and lignite ii) ySt$eti , finer than PEwxNTA~BBY WElorlT, AfOX L-_--~ c--UncruCrushed shed PERCENTAOE BY WEIQRT, Mer r---h_-_UncruCrushed shed (3) (4) (5) (6) (7) IS : 2386 (Part II)1963 180 198 1*oo 1*oo 1-00 I.00 188 188 34io 380 360 - - do Clay lumps iii) FINEAQQREQATF. COARSEAQQKEOATI 75-g IS : 2386 (Part I)1963 IS : 2386 \p&; II)- 3.00 1588 - iv) Soft fragments V) Sltkle do 1.9iJ - - Total of percentages of all deleterious materials ( except ‘mica ) including Sl No. (i) to (v) for co1 4, 6 and 7 and Sl No. (i) and (ii) for co15 only - 5.00 2.00 5.00 vi) 5-88 presence of mica in the fine aggregate has been found to red NOTE 1 -The considerably the durability and compressive strength of concrete and further investi tions are underway to determine the extent of the deleterious effect of mica. I advisable, therefore, to investigate the mica content of fine aggregate and m suitable allowances for the possible reduction in the strength of concrete or mortar. No& 2-The aggre ate shall not contain harmful organic impurities [tested accordance with IS : 23 pi ( Part II )- I963 ] in sufiicient quantities to affect adver 6 the strength or durability of concrete. A fine aggregate which fails in the test organic impurities may be used, provided that, when tested for the effect of orgi impurities on the strength of mortar, the relative strength at 7 and 28 days, reporta accordance with 7 of IS : 2386 (Part VI )-1963 is not less than 95 percent. TABLE 2 COARSE AGGREGATES ( ChAws 4.1 and 4.2 ) PEILCENTACJE ISSIEVE DESSQNATlON p---7-------- 63 mm (I) (2) 80 mm 100 63 CD mm 85 to 1cla 40 mm 0 to 30 20 mm 0 to 5 10 mm 4.75 mm 236mm 40mm (3) - SINGLE-SIZED AGQREQATE OF NohlINAL SIZE h-~----~_.-._---7 20 mm (4) 16mm (5) 12.5 mm f---------- Pnss~xc. FON GRADED OF ~~OJIINALSIZE h-----__-, 10 mm 40 mm 20mm 16 mm 12.5 mG (10) (11) (6) (7) (8) (9) _- 103 - - - - 100 - - - - - - 85 to 100 at020 100 - - - 95to 100 100 - - 85 to 100 100 - - - 30 to 70 - - - - -- - 85 to lou - 100 85 to 100 0 to5 0 to20 01030 Oto45 - - 0 to 5 0105 Oto10 - - - - 0 to 5 PERCENTACE AQGKEGATE - - - 16mm 12.5 mm P~SWNGKII~ - 100 85tolOO 0 to 20’ Oto5 lOto 0 to5 - 95 to 100 25 to 55 OtolO - 100 9oto100 30to70 oto10 - 100 90 to 100 40to85 0 ro 10 - ls:383-1970 TABLE 3 SIZES OF COARSE AGGREGATES FOR MASS CONCRETE ( CLausc4.1.1 ) CLASS AND SIZE Very large, ISSIEVE DESIONATION 150 to 80 mm PERCENTACEPASSISQ 160 m...
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This document was uploaded on 10/01/2013.

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